Virt‑Manager with QEMU on Arch Linux

Last updated on March 30, 2025

Virt‑Manager is a graphical user interface for managing virtual machines through the Libvirt virtualization API. This tool simplifies the process of creating and managing virtual machines without requiring direct command-line interaction.

This guide focuses on implementing KVM (Kernel‑based Virtual Machine) to achieve high‑performance virtualization using Linux’s native hypervisor. While other solutions like VirtualBox or VMware are available, KVM offers superior performance and native Linux integration.

Prerequisites

Before proceeding with the installation, verify that your system supports hardware virtualization. This capability is essential for KVM performance:

Hardware Requirements

Verify virtualization support in your system:

LC_ALL=C lscpu | grep Virtualization

Note
For Intel processors, look for VT‑x in the output. AMD processors will show AMD‑V instead.

Ensure KVM modules are properly loaded:

lsmod | grep kvm

The output should display kvm_intel for Intel processors or kvm_amd for AMD processors, along with the base kvm module.

BIOS/UEFI Configuration

Enable virtualization in your system’s BIOS/UEFI settings:

Intel systems: Enable Intel VT‑x and Intel VT‑d.
AMD systems: Enable AMD‑V and AMD IOMMU.

Important
If you need to enable these settings, a system restart will be required.

Install Dependencies

Install the required packages:

sudo pacman -S libvirt virt-manager qemu-full dnsmasq dmidecode

Enable and start the required system services:

sudo systemctl enable --now libvirtd.service virtlogd.service

Configuration

User Permissions

Add your user to the libvirt group to enable management of virtual machines without root privileges:

sudo usermod -aG libvirt $USER

Note
Log out and back in for the group changes to take effect.

Network Configuration

Enable automatic start of the default virtual network:

sudo virsh net-autostart default
sudo virsh net-start default

This configuration prevents the common error:

"Error starting domain: Requested operation is not valid: network 'default' is not active"

Verification

Verify the installation by launching Virt‑Manager:

virt-manager

The application should start without requiring root privileges and display no network connection errors.

References

Libvirt Documentation – Comprehensive guide to libvirt
Virt‑Manager Wiki – Official Arch Linux documentation
QEMU – QEMU configuration and usage guide